Perhaps your project can include a "memorial" in the readme or some other wiki page as sites shutdown, including the site url, any claim to fame, and the date it died. This page may eventually serve this purpose: https://en.wikipedia.org/wiki/Comparison_of_BitTorrent_sites

As it is, if you were to [edit:actually link] the list of sites you currently support I'm certain your project would draw some unwanted attention!